After a sys-kernel/linux-headers upgrade, it might be nice to have a libc built against that. Would it be useful to do this automatically using sub-SLOT dependencies?
it's rare for this to actually matter ... at least, certainly not to the degree where we want people to be rebuilding glibc constantly: - glibc includes its own defines for functions, so new kernel defines won't change anything - glibc really only cares about new syscalls, and even then, new syscalls often show up that glibc never uses it's not even stable across arches, so while moving between versions on one arch might produce new functionality in one, it might not in others. so there's no subslot the kernel headers could provide to be meaningful.
